The MagPi Issue 25

Page 21

4) When the installation procedure has finished, connect the BitScope Micros USB port to the Raspberry Pi as shown in Fig. 1 . You will need a powered USB hub to do so, because normally both USB ports of the Raspberry Pi are in use for the keyboard and the mouse.

BitScope DSO software main screen elements (photo courtesy by BitScope Designs) Figure 2:

Figure 1: Connecting

Raspberry Pi via USB

the BitScope Micro to your

5) You should be able to start BitScope DSO from the main menu now and see its splash screen on your monitor. With your BitScope Micro connected click POWER on the right side of the splash screen. With BitScope DSO up and running and the BitScope Micro add-on board connected, the only thing left before we start exploring the system is to familiarise ourselves with the user interface on the screen. Fig. 2 shows the main screen. In the main display (1 ) you will see the results of the measurements in graphical form. This output is dependent on which buttons you choose on the right side (2). When measurements are taken is very important if you are working with an oscilloscope. Electronic engineers talk about triggering. (3) is called the trigger window, which we will leave at the default automatic mode for the moment. We will change the trigger behaviour with the trigger controls (4) at a later

time. For exact measurements, BitScope Micro supports us with so called cursor measurements (5). With the time base control (6), we are able to zoom in and out of a graph and therefore see more or less details. The channel controls (7) let us influence the input, its source, range, vertical position and scaling. Last but not least the capture control (8) defines the capture sample rate, duration, frame rate and display modes. First measurement

To check if your setup is ok and working, connect one of the test leads, which are included with the BitScope Micro, to the channel A pin (marked CHA (yellow), see Fig. 3):

Pin layout of the BitScope Micro (photo courtesy by BitScope Designs) Figure 3:

Next change the time base (6) to 5msec/Div by clicking on the left arrow key until this value is


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